Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c26ebf95f1b572…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 23:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 029bf1b9880e706cfe8c6849bc771e66 SHA-1: 313a24c0d96112aeaf14cbf7f952b1584749a6ec SHA-256: 75c26ebf95f1b5721db3ae1ee6fd0fbba17e80a07a48528a19d9c64ca6fcc93a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. One heuristic specifically identified a link farm pointing to compromised WordPress upload storage, and another flagged a URI pointing to a raw IP address, indicating malicious intent to redirect users to untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161407f18a2561---gumaxilebuti.pdf In PDF document text
    • https://ms1oke.com/contents/files/tenekiborezodasokeva.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/mesejasajodafalapeve.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/85986018577.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/sonoza.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/wuvawejileb.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210907215826-tukutij.pdfIn PDF document text
    • http://besteva.com/upload/files/jenevedemed.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/73900238166.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/20909606442.pdfPDF link annotation
    • http://kcntanduc.vn/img_duhoc/files/zunabidagi.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/25155066133.pdfIn PDF document text
    • http://e-hematologica.com/users/file/pevafipo.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/bf79a9dde791ca465af900a56d1faf66/9927835220.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/jukajofoxezivarovifo.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/71973891860.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/bebow.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/getonoxegivimebusesisida.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/peleginij.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/51922452920.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/fuxuxi.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/fibisutuguvipozu.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ngacfgtsqauf287fokkeab9qv3/91221001274.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/74211441708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=electric+man+2+no+flashPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EE 15496 bytes
SHA-256: 0a64b9cfa4f759178ceeed794ed14f40d99ef1ca468e359b53cf8b384771f5b4
font_01_sfnt_off0000d8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A3 10704 bytes
SHA-256: e739d3aa8db72466a97339e807ab4051ffea3442d88d39dba3bef119ff4ff6b6
font_02_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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